brian cooley is with us today and this is scary. i mean, hopefully we can get some advice on how to avoid this or, you know, some sort of immunity. this hacking is scary. >> reporter: this was sneaky. we have video that shows what happened if you got stung by this so here's an example. this is an antivirus company, so if you go to a twitter account in this case, would you find a typical twitter update and so let me show you what one of these looks like and would you mouse over it. no one is clicking. just follow the mouse cursor and as soon as you hover over the twitter update it takes you to another web page in this case a twitter page and hovering over the black area which is also a hack and goes to another area. >> you're not clicking. >> not downloading, opening anything, none of those things, you didn't have to do it here. you just moused over something so this was used to send people in some cases to some porn sites, to some people to other websites, it could be used to do almost anything and make a pop-up jump up like you see